[jira] [Created] (CALCITE-5464) Implement BigQuery DATE_ADD/DATE_DIFF

["Tanner Clary (Jira)" <ji...@apache.org>]

Tanner Clary created CALCITE-5464:
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             Summary: Implement BigQuery DATE_ADD/DATE_DIFF
                 Key: CALCITE-5464
                 URL: https://issues.apache.org/jira/browse/CALCITE-5464
             Project: Calcite
          Issue Type: Sub-task
            Reporter: Tanner Clary


Add support for BigQuery DATE_ADD/DATE_DIFF functions. 

{{DATE_ADD(date_expression, interval)}} adds the interval to the date expression.
Example: {{DATE_ADD(DATE '2008-12-25', INTERVAL 3 DAY)}} would return '2008-12-28'.
[BigQuery docs|https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions#date_add]

{{DATE_DIFF(date_expression, date_expression2, time_unit)}} returns the whole number of time_unit between the first and second date expressions, with the result being negative if the first date is earlier than the second.
Example: {{DATE_DIFF(DATE '2008-12-25', DATE '2008-12-28', DAY)}} would return -3.
[BigQuery docs|https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions#date_diff]



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